html, body, div, ul, li, h1, h2, h3, h4, h5, h6, p, dl, dt, dd, ol, form, input, textarea, th, td, select {
    margin: 0;
    padding: 0;
}

ul，ol{list-style:none;}

a{text-decoration:none;}

input{
    border:none;   // 清除默认边框
    outline:none;  // input标签聚焦时不出现蓝色边框
}

h1,h2,h3,h4,h5,h6{

    font-weight:normal;
 
 }

 em,strong{

    font-style:normal;
 
    font-weight:normal;
 
 }


 button{

    border:0;   // 清除默认边框 
 
    background-color: none;
 
    outline:none;
 
 }





 